This is #1

[browningautorifle]

a 5-inch (127mm) L54 Mark 19 gun

Hard to fathom the length of it without scale. The Leopard round should be enough for me but I'd forgotten how big they were, I had two brass cases here for a few years until the move from East coast to West coast and I shed them. Wish that hadn't happened. I'm sure someone would have bought them from me by now anyway, that's a lot of brass...yours is a meter tall with projectile. 39.6 inches to be exact...

[bombdoc]

It is a TPTP round, Target Practice Trace Projectile, coloured black as opposed to the Mil. green HEAT round.
The insides are identical to the real thing, but the charge area is filled with white clay to maintain weight, the piezio ignition is for the base trace charge.

You may be mistaken here.. the NATO standard colouring for Anti Armour is Black, Practice is Blue, HE is green, smoke is Eau de nile and illuminating is white.. I think Aus is still in NATO, and this is what we taught your ATOs in UK!

The piezo element is part of an impact fuze, and would not be connected to a tracer element.. tracers are normally ignited by the propellant..

... here is one for you!

Attachment 108119

...and for extra points, where was it made?